Many times the public hears the term Stormwater Management, MS4 or a combination of the two phrases. What does MS4 mean?

'By definition an MS4 (Municipal Separate Storm Sewer System) is a system of conveyances that include, but are not limited to, catch basins, curbs, gutters, ditches, man-made channels, pipes, tunnels, and/or storm drains that discharge into Waters of the State.'